VHDL stands for VHSIC (very high speed integrated circuit) HDL From Boolean algebra, we know that each row of a truth table represents a product term and the output can be written as the sum-of-products expression-VHDL stands for VHSIC (very high speed integrated circuit) HDL From Boolean algebra, we know that each row of a truth table represents a product term and the output can be written as the sum-of-products expression